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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2dd373d4590d929b5f9150884d2d0eb6f11d2bbfe89e0017a4c5d52aa77acf' 
  AND token = 'JTHwJ7KHeEug0uyJSDFolblK8poSVtu5ScMdnKzoRso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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