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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03e2e0af38195c0079f61004bcc4f0d8e1732f0ab47cdef26d645d628b8198c' 
  AND token = 'mYWssdj4DZciuQQeyo33uU8vPIC7fo6rjT0vC/1amqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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