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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb71e61c328488747ac60cc9f652e95eebc58e32f195f76f1486740969d5631e' 
  AND token = 'eoYz0yNZs49fVU+tiNj/YR0Il8EhW7zdCV4fXM7o9Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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