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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e9cabab02bcf3b08e94ee3a17795012733773e7e4b4f2619e7f5fc136fab06' 
  AND token = '2w7XpBQ7aAk4aIRzLidi0ivE44+YWyep9OvjL86QKGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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