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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fedbcc9bb0d692bf3f3993a8a96a2f70ac47544b39f947d936c41eb1e2a5a3f' 
  AND token = '1FIX28srp3GtPtY5VjO/PPNB2ipSN+qNCjmb9LzPO6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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