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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7fa62ec71076289851a9c6ef97149619c75746e0da393dd48d5d4a4b87f3f1' 
  AND token = 'hsZ0sExC4Tmk2AsVFUfnZ7zP2tNSMZZrSlsDxmhq2bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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