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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b0358114ef0a758b2c9ac88f2b50c5118161e55b8f1f262dbf0e4d6cd928e3' 
  AND token = 'aGdVg0uk5UZGARIWDNULLxmEXeLn0NycfMiI2wL3fvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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