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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620b1b19c34d7a0cc1cd96015a0ffe41c75301fa05427e9ec7856932b7084569' 
  AND token = 'NL/vv76b3Ma1ccauFvJXHyn4G1m6osGzlNyIMureAAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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