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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472b54f9d3a42ed25f5f5f982dfd7ac04693e643e7cba5b0fe89ad0b52c09ef8' 
  AND token = '/NURy3UXHmOqIubK2g+n2ctlMMUjIjnIY7hwvTqyMek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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