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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3bc103397379666418edbf06420a811db19cb67cdee99cf93c8f439ff17376' 
  AND token = 'VVIjt6hNSxqSlJ2aXI7U9Au9F0jeG+1v2EecOezMHgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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