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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5611cedf7a1b2e43cde768ccb1bb2022bea9cb1e45f2c988975e418be4ae95ff' 
  AND token = '2lBzaSgzyxF66UQHnFcEYMBHLRbsYbnBwUEb1Y68KlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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