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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc3819f5bfe76d8740f6534130e37cd5dab4b3409d260ecd804179f9c8040fe' 
  AND token = 'M2ng0ni0DZzNwG6j3WE/GGvIyDioq9EH38wAwDt/QMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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