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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe04d0ae23bbe0e8a1c9e19ee0bbae80eaf7989a57c88d8dc8a32792af28d0ae' 
  AND token = 'q4gp/gpWC6WtnuDl6KTC7oIWMP2FeANeoSwN5b50c4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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