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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7904b7a5b674988541549a3e23abedfd012857058af3ed626ab6f2f542c3f826' 
  AND token = 'IAMs92wP6raUNV9jpROud1btx5v7zvADXtOvDCM0BUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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