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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26af766e293ad74c8d3d4de433a05e6f0c8344356a791125f65c0ea59f098de2' 
  AND token = 'd8Fi/m+RUwmK2e5HhhyHNNDPMG7DuyyUgUc9NWz9NHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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