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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc9666b57c2b65ea4c7a554360925217d2d5ddb910905b9a4f437aabae28783' 
  AND token = 'AQNOktM5XdivuM51N6+FfOo3IMlFsY/by6JpIUHzgBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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