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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3335889d3ee67da2ca3a99e25fefa76dd9c29e62ee4bce36eea5a2ee1cb6db15' 
  AND token = '05CfDBGHibDrsB1HADFt4Mvd8+/xDRbHEspE2E9s0Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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