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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1896843cf50a6112091cef7dc101509aed25684e8dc529f9a6ce785add47ed43' 
  AND token = 'zzjyDsXQZ14ZyWcsGpLKUu2LaQA+3MEl5++tI4A3AO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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