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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3e206a1c7b2aa6afefb236904692d7dd416a462a15bde40878717e5d6b88f0' 
  AND token = 'PY5SrE1EF1E8SRrXsWnbYwmuHQZZfF7IHMsUFd8hIh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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