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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1659eaf5bd9a4c7d63fb01f21f04980e0abb6d4604feedf2b14e431a2e94a2' 
  AND token = '0Zx1yZA2io5yfODd0UFhA8NOuZA5ksEhodBa9iXA8s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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