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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1139c58b2a6e4b42c4c4e26ab98030f1fb382df487726451ff73813275fbea1' 
  AND token = '+rf04izZ9gTvmNtFUziDMmqHZtTxnV3KmgdIoI7zO0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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