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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e72e1a44eadda8aad34980e7b5e360829b1299a6d0a9f7abc911c01595d7bbf' 
  AND token = 'lGWdvTv71w3uc1FVJTYz1rFi9E2f+q8p2zGuMDQm55w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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