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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4d104d81edb6f99cdb7ba4a08d6dd0b8ada6ef3a41cdd7d65733a3843d71fc' 
  AND token = '5jrIiRE2jsZFpMSlVHgu/aZUQ8H4JS28lhqKOXrEklI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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