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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cfd74a39139f3f7fb79d52eb0ff3819b19d63f2a8de24206fdc270e6211a21' 
  AND token = 'Fg+78Sj7ObHuo34TA9F62VoCisR0ocrUxL8UQoG601g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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