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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b12002d558b816e94385b1dfd36189894131a6ecbf41faf094eef081bc81be' 
  AND token = 'BNn5W6n3bWO+YnZg1t3IGjITM2atnRkd90GuAYVPRV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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