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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a5041ed0c726902047999a0186d5ac381f3a91d93ea8b14670a033a01c2912' 
  AND token = 'gCli9+so9RPiV7bPrER/PGaULW23mZX/2k8Gk2JvQUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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