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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85af53ce7568ad70e35ec61b4bfa763a36d884a1ecdab46ada8294b84dadb14e' 
  AND token = 'AP9Cqf0YK8OcvOp4nSyR+XR0BT7T8+EEG8r4TPyB8sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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