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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b91ff11a6ad9ee1fd86553fda23aebcfa2e1637c277f5ed73d1236503b226b4' 
  AND token = 'BsbLN97bRwBP3n+SK72G5pyE+dX9s03JGmpdlIqzORU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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