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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c163489d3c3d3c646b36a772fe71db43a82566c009feaf0fc2e7a10b2d05e7' 
  AND token = 'PQaEm7HOArUoTXUSajX1MjVhxZU0fFtnB0gN6nw7g/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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