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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc7f155eedd307b2ea446ba4d7339cd8c65daa536be7cdc3b48848b65b545ea' 
  AND token = 'QmRc3GHWnq7Bl6g1dCAokEHEfqL7s/4i8u95+LSY4wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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