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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77f67dc5003a5aa4f67962fb61ac2938832e998c810abb5d65927d1275a9992' 
  AND token = 'F6z6N4nvoXRPnpJhpBpQIz2hOwL2PqWy3Q4yBMSNAQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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