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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7349796a8227a72a2c5b05d11e7de75c58c2173ea21171516afa8ef88a87d17' 
  AND token = '7ekHYRZIQLTzt7PzSCFLPFtYbXa0v5SpAvfUx90U4yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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