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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f088918dc2de8174108a04237dda7561ea0135da9f238118634a019b109f06e9' 
  AND token = '2Bm3W9WwOFxzrLvYuYdMc+/dFX+1PICLonrqC9u8sXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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