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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47d03fbc826026feae56e1ac094151e2d987ea2e4c8f458d1732b29db0d043a' 
  AND token = 'CGJvK2/hBtdxbTriNEHU5itjBxD205CTn3CwAA8kTFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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