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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4267364e2c779f2f6733d559b6b1e96dc78fe46ce28b4df28d6fcd0e3c9892fc' 
  AND token = 'Y8B8kJ5rd0Ngj3H7wiqT82vLCV24vYH2yUrXCheQblQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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