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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419360a964ccaf79a249ac7e82b7b835bf4fb069cb12d23592ed2907c70c7007' 
  AND token = 'wK/1Cr48EVCAwucdvm/XQaZzPlpSff+ISy99/7eiG6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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