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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85661832f3f60b6a3146fb69bfd9ea2f4b515d8eb6f8ea4e19184141644438b' 
  AND token = 'N4XNlaryWKyb4xOlCL8u5BvnF4JOqvp3M/oa+Gqgmi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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