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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f20d41d57eb4b143bd2908a7803e1176beeee9f79e18a005570130cccb6c4c' 
  AND token = '8s8D8ELFdPKh0gsNj2JDDWf2VkkkZ38SeN5OI3zcIEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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