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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c37f50fdd675f1323bd0ebd4038346edcdf77668c2cbe21bebe6639637fc3d' 
  AND token = '3pAnul6RN4S/wAsqDbPEUsblLrm0v6ovHc15sU3UY0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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