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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4285baf2c96b542060e2aadf3be5b91b4a57da2a4e9cbdc7a774bc28abfbda' 
  AND token = 'aWHUEnDSfukvXvkkWpjinj3RM+euBkTCUocEyn7SYEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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