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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b54af88cd78476a8141968f9697062a79d7b5cd494dbb28c6ffeff98816cd6' 
  AND token = 'np+PE6iJgxi4c4Eh1ClUNVoqPi0a82EFugHUss9WMPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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