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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf03fe1802d22a0411666d33df64e2c60e469c2e4c85c34eb6bd99c953cee0a3' 
  AND token = 'jObJr1gCF0FWC9zlThbnJn7KoPsTYDnDN/rIxKQluQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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