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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad86a0e46ff0599805b9f0cd419d9b404f00247488e329d4978854939a748986' 
  AND token = '8g1v6ORkMRMCPE0s9a0KK2wURRx/3nIsro5Mz1iAxC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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