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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c027accc7ddcac74f516cab012ac45a8b43c4fb557e5f9f758fbc77ee4620cd' 
  AND token = 'xHmId7F3sPe03zRXaqGa8G/tmr2eE1tdJA316F6jM/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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