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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abf213a8558aca22bf36b70a780bda0e32e9150506414ee29d88b0ff456ce64' 
  AND token = 'SRKmqeiCcTMVh1nGOhv8G2iN2eo/6WldlMk4PJRxx6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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