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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc360ee2959b03224ce7c62fd830c109445ca5e8aae5f3e8ea13f9b760e2a14b' 
  AND token = 'YzShvQfd9W4QdyRig2g43bdRfADGtEj/mm2J3zV4AzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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