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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5780b6bf53892770ce1ebbdb092c0280804c8976c919c30596f6a13f949512' 
  AND token = '0tkEJYFtVfFKJ282c2LyNPgRkd3vS71HE5dHy4aaNSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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