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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ac2cf38e0763b068f5d23a4a3dff8c0cd849388d9cbb87264dd16b82f9d48d' 
  AND token = '00C3xioMwSFOdjIPMi8IBUORsFJC2AXNcMlKvznRHtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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