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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab02534918b6bfa58918ef1d4026b8ac8289dd8763bb96d9158eae655e96cdc8' 
  AND token = '72tMAUQIGGTQrnkp8iG5eOZgzWMKMA+D70dJmSq3R3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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