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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4c587942b4fbdf759aa1c3ec831496f29d228e06aa1f0f6ea4c24209ac06a7' 
  AND token = 'nsJUMlRh5qxcnY0wvlh72UvU5s8oVPw22rrmf9G0YKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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