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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0415fc00e92507840884c2242c7638052fc9c65b7f0484c3855367516934940f' 
  AND token = 'p1yGInKq09T3GSL1ru2e+F7MalXiI1pkCehgyEU/cuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}