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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e9a4aef9bb1ad569766d577c81a72279fa4e28b7bbbd1912e2a2b026e31d5a' 
  AND token = 'l8/w8KIg0A51DYwXfxk46ERK9mwo+GZhuDay2HeHI8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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