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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d47421118bdaa8b20cfe2480be59c76623cdec0aed1dc63294d616f4891a0fa' 
  AND token = 'NCVJr4c4p9d9rdbWiq4DXUun/t6joCq4BSRB6Gy66CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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