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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbf84b8120db885cc644ebad5d6f05639b0b89a51cec6a2a07f469b1f0fb18a' 
  AND token = 'bAsBhy+iPYoO8YrBxjAEqZJR6tZ0Z2J4lLMKnhFmbgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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