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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d16aa325b2364a4d3825a090739d516a123646d54ffa310557f87077013a09' 
  AND token = 'CnfgZb1v0KnqwfKHJRvSXTSHistbr37SXm9mTYniMC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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