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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bd2b752450b4d2e8928fbeb30cf479903cc117394cc88c1266f64d4b300407' 
  AND token = '/D7RGyAV48AqhyNCsK6Uc3NKVS6MyCwXePwkP2ynx9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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