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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c69ee5c45baf46a8c9436dda14c9c13a2e3c9fa1ea75dc3e41b5a422cf6c16' 
  AND token = '6fIwBBBkzBKnae3gZmqBKiEwKdC9PmfLowixFTCpK9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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