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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8218c5b436dbaac1e5d3f8cdcc48c3faf4d97c67d58610f04e36e239b0fb6d' 
  AND token = 'Wy14lG6e3YKNQqYhiKNv8XE6ZJnuNO+JbGHrpUo365Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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