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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afa4045589a4443c214ea6c445f0dea6133156ae654c3fdcc638d7b18a2d7e7' 
  AND token = '8zlG/DDWpOdGVUus9LKcmg8YQ4j8mEmzpnVQPLDqlF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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