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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b316a4e659e88f39557ce95f44e41e94c2363e824bb30f0987170e05c2ea2ef7' 
  AND token = 'ATNMCL8tQdU+LZF6LtFdm5If2uNbAtKWVGnqiAkbNMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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