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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d03f158ebebbfc20554bae6c56b9f3b400c4092344439c4b29651066263c2e' 
  AND token = '94tVJiId/1et8r5agGSXgxriISuwjWrCjg+Gabpq1S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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